Deleted a post but it's still showing in feed reader

I deleted this post: https://www.news.actc.org/archives/411

but it still shows using rssinclude feed reader on my web page: https://www.actc.org. See near the bottom of the page, “Let?s Go Bike Camping at the Russian River Rally!”.

I created a new post, which appears here: https://www.news.actc.org/archives/430

But the rssinclude feed still shows the old one link, and clicking it shows PNF.

Other posts show up fine in the feed reader so I suspect this is a wordpress problem.

Jeff